In Fig. REF  we present results for the relic density in the \(M_\chi \)  versus \(M_{Z_{B}}\)  plane. The dark blue line corresponds to the measured relic abundance by Planck satellite measurement of \(\Omega _{\rm {DM}} h^2 = 0.1197 \pm 0.0022\)  [1]}. The region shaded in light blue overproduces the dark matter relic density and it is ruled out unless the thermal history of the Universe is modified.
We show results for four different scenarios, \(g_B=0.1\)  (top-left), \(g_B=0.3\)  (top-right), \(g_B=0.5\)  (bottom-left) and \(g_B=\sqrt{2 \pi }/3\)  (bottom-right).
